Tuesday, March 3, 2015

[Herpetology • 2015] Tylototriton anguliceps • A New Species of Tylototriton Anderson, 1871 (Amphibia: Salamandridae) from Northern Indochina


Angular-headed Newt - Tylototriton anguliceps
Le, Nguyen, Nishikawa, Lan, Nguyen, Pham, Matsui, Bernardes & Nguyen, 2015

ABSTRACT 
We describe a new species of Tylototriton from northwestern Vietnam and northern Thailand based on morphological and molecular evidence. Tylototriton anguliceps sp. nov. is distinguishable from all the other congeners by the bright to dark orange markings on the head, body, and tail, prominent dorsal and dorsolateral ridges (crests) on the head, skeletal connection between maxillary and pterygoid, and unique mitochondrial and nuclear DNA sequences. Our molecular data show that the new species is nested within the clade comprising T. uyenoi, T. shanjing, T. verrucosus, and T. yangi. The new species is expected to be recorded from other countries in the Indochina region such as southern China, western Myanmar and northern Laos in the future.

Keywords: Tylototriton, Molecular phylogeny, Morphology, New species, Vietnam, Thailand





Dzung Trung Le, Tao Thien Nguyen, Kanto Nishikawa, Son Lan, Hung Nguyen, Anh Van Pham, Masafumi Matsui, Marta Bernardes and Truong Quang Nguyen. 2015. A New Species of Tylototriton Anderson, 1871 (Amphibia: Salamandridae) from Northern Indochina. 
Current Herpetology. 34(1): 38-50. DOI: 10.5358/hsj.34.38

Sunday, March 1, 2015

[Ichthyology • 2015] Rhamphichthys heleios • A New Species of Rhamphichthys (Gymnotiformes: Rhamphichthyidae) from the Amazon Basin in Brazil


Rhamphichthys heleios T. P. Carvalho & Albert, 2015

Rhamphichthys heleios, new species, is described from the Amazon Basin in Brazil, being known from lakes and channels associated with the floodplains of large rivers. The new species is readily distinguished from all other congeners by a unique color pattern, composed of a series of dark irregular rounded blotches along the lateral body surface over the lateral line, and by the absence of clearly formed saddles across the dorsum. Comments on the taxonomy and use of color pattern for the systematics of Rhamphichthys are made based on examination of extensive materials in museum collections, and a key to the species of the genus occurring in the Amazon Basin is provided.



Rhamphichthys heleios, espécie nova, é descrita para a Bacia Amazônica no Brasil, sendo encontrada em lagos e canais juntos a planície de inundação de grandes rios. A espécie nova se diferencia das demais espécies de Rhamphichthys pelo seu padrão de colorido único que é composto por uma série de manchas escuras arredondadas na lateral do corpo ao longo da linha lateral e pela ausência de selas escuras no dorso. Comentários sobre a taxônomia e o uso do padrão de colorido na sistemática de Rhamphichthys são feitos basedo em uma extensa revisão de material em coleções e é fornecido uma chave de identificação das espécies do gênero da bacia amazônica.


Carvalho, T.P. & Albert, J.S. 2015. A New Species of Rhamphichthys (Gymnotiformes: Rhamphichthyidae) from the Amazon Basin.
Copeia, 103(1): 34-41. DOI: 10.1643/CI-14-066

Saturday, February 28, 2015

[Herpetology • 2014] Kaloula latidisca | อึ่งอ่างมลายู | Wide-Disked Narrow-mouthed Frog • Reappraisal of the Javanese Bullfrog complex, Kaloula baleata (Müller, 1836) (Anura: Microhylidae), reveals A New Species from Peninsular Malaysia


อึ่งอ่างมลายู | Wide-Disked Narrow-mouthed Frog
Kaloula latidisca Chan, Grismer & Brown, 2014

Kaloula latidisca Chan, Grismer & Brown, 2014
DOI: 10.11646/zootaxa.3900.4.7

Abstract

A new species of Narrow-mouthed frog of the genus Kaloula is described from northern Peninsular Malaysia. Kaloula latidisca sp. nov. is genetically and morphologically most similar to K. baleata and K. indochinensis but differs from those and other congeners by the unique combination of the following characters: (1) adult males SVL 49.2–56.2 mm (x̅=53.5 ± 3.0; N=4); (2) finger tips expanded into large, transversely expanded discs (disc width 2.8–3.1 mm, x̅=3.0 ± 0.1); (3) inner metatarsal tubercle large, oval, distinctly raised, slightly shorter than first toe; (4) three subarticular tubercles on fourth toe; (5) toe webbing formula: I 1–2 II 1–3 III 2–3.5 IV 4–2 V; and (6) yellow to orange irregularly shaped patch on the axillary, inguinal and posterior region of thigh.

Keywords: morphology, multivariate, statistics, systematics, taxonomy




Chan, Kin O., L. L. Grismer & Rafe M. Brown. 2014. Reappraisal of the Javanese Bullfrog complex, Kaloula baleata (Müller, 1836) (Amphibia: Anura: Microhylidae), reveals A New Species from Peninsular Malaysia.
Zootaxa. 3900(4): 569–580. DOI: 10.11646/zootaxa.3900.4.7

Pauwels, O.S.G., Ohler, A., Dubois, A. & Nabhitabhata, J. 2000. Kaloula baleata (Müller, 1836) (Anura: Microhylidae), an addition to the batrachofauna of Thailand. Natural History Bulletin of the Siam Society. 47, 261–263. siamese-heritage.org/NHBSSpdf/vol041-050/NHBSS_047_2o_Pauwels_KaloulaBaleataMul.pdf

[Herpetology • 2015] Stumpffia kibomena • Beautiful Bright Belly: A Distinctive New Microhylid Frog (Amphibia: Stumpffia) from eastern Madagascar


Stumpffia kibomena
Glaw, Vallan, Andreone, Edmonds, Dolch & Vences, 2015

photo: D. Edmonds iNaturalist.org | DOI: 10.11646/zootaxa.3925.1.8

Abstract

We describe a new red-bellied species of the microhylid frog genus Stumpffia from the Andasibe region (18°56' S, 48°25' E, ca. 900 m elevation) in central-eastern Madagascar. Stumpffia kibomena sp. nov. differs from all other described Stumpffia species in coloration, morphology, and by genetic differentiation in the mitochondrial 16S  rRNA gene (≥8.6% uncorrected p-distance to all other nominal species of the genus). It is furthermore distinguished from most other Stumpffia species by its advertisement calls. The new species is reliably known only from a few specimens collected in the Andasibe region and based on the limited knowledge we suggest its IUCN Red List classification as "Data Deficient".

Keywords: Amphibia, Anura, Cophylinae, Madagascar, Microhylidae, Stumpffia kibomena sp. nov.



Stumpffia kibomena
Glaw, Vallan, Andreone, Edmonds, Dolch & Vences, 2015
photo: Devin Edmonds iNaturalist.org  


Frank Glaw, Denis Vallan, Franco Andreone, Devin Edmonds, Rainer Dolch and Miguel Vences. 2015. Beautiful Bright Belly: A Distinctive New Microhylid Frog (Amphibia: Stumpffia) from eastern Madagascar. Zootaxa. 3925(1): 120–128. DOI: 10.11646/zootaxa.3925.1.8

Stumpffia sp., Marojejy, Madagascar
by Frank Vassen https://flic.kr/p/78voVb

[Mammalogy • 2014] Molecular Phylogeny and Morphological Revision of Myotis bats (Chiroptera: Vespertilionidae) from Taiwan and adjacent China


Myotis soror Ruedi, Csorba, Lin & Chou, 2015

ABSTRACT 

In taxonomic accounts, three species of Myotis have been traditionally reported to occur on the island of Taiwan: Watase’s bat (M. formosus watasei Kishida), the Formosan broad-muzzled bat (M. muricola latirostris Kishida) and the Formosan mouse-eared bat (M. adversus taiwanensis Linde). The discovery in 1997 of an unknown taxon not fitting to the description of any of these species encouraged us to re-examine more thoroughly the systematics and phylogeny of Myotis bats inhabiting Taiwan. We used a combination of morphologic and molecular methods to aid the identification of the different taxa from this island and reconstruct their phylogenetic relationships. Multivariate analyses based on 17 craniodental characters of 105 specimens caught across Taiwan and further external characters allowed us to discriminate eight taxa of Myotinae co-occurring on this island. A subset of 80 specimens were further sequenced for the cytochrome b gene (1140 bp) and subjected to phylogenetic reconstructions including representative species from adjacent China and from all main lineages of the worldwide Myotis radiation. These molecular reconstructions showed that the Myotinae from Taiwan are phylogenetically diverse and are issued from several independent clades. The genetic results were completely congruent with the phenetic groupings based on craniodental and external morphology, as each of the eight Taiwanese taxa proved to be reciprocally monophyletic. Two unnamed taxa that did not fit into any of the known species were described as species new to science. Furthermore the taxon latirostris usually associated to the Asian M. muricola, was phylogenetically and morphologically distant from any other known Myotis and was assigned here to the fossil (Miocene) genus Submyotodon. Submyotodon latirostris, M. secundus sp. n. and M. soror sp. n. are endemic species from Taiwan, whereas the other five Myotis are more widespread and also found in the mainland. An identification key is provided to ease the discrimination of these Myotinae species in Taiwan and adjacent China.

Keywords: Myotinae, Submyotodon, cryptic species, multivariate analysis, cytochrome b, taxonomy


M. Ruedi, G. Csorba, L-K. Lin and C-H. Chou. 2015. Molecular Phylogeny and Morphological Revision of Myotis bats (Chiroptera: Vespertilionidae) from Taiwan and adjacent China. Zootaxa. 3920(1):301-342. DOI: 10.11646/zootaxa.3920.2.6

Friday, February 27, 2015

[Botany • 2015] How to Catch more Prey with Less Effective Traps: Explaining the Evolution of Temporarily Inactive Traps in Carnivorous Nepenthes Pitcher Plants


A worker ant collects sweet nectar from the trap of an insect-eating Nepenthes rafflesiana pitcher plant
photos: Ulrike Bauer, University of Bristol, U.K.

Abstract

Carnivorous Nepenthes pitcher plants capture arthropods with specialized slippery surfaces. The key trapping surface, the pitcher rim (peristome), is highly slippery when wetted by rain, nectar or condensation, but not when dry. As natural selection should favour adaptations that maximize prey intake, the evolution of temporarily inactive traps seems paradoxical. Here, we show that intermittent trap deactivation promotes ‘batch captures' of ants. Prey surveys revealed that N. rafflesiana pitchers sporadically capture large numbers of ants from the same species. Continuous experimental wetting of the peristome increased the number of non-recruiting prey, but decreased the number of captured ants and shifted their trapping mode from batch to individual capture events. Ant recruitment was also lower to continuously wetted pitchers. Our experimental data fit a simple model that predicts that intermittent, wetness-based trap activation should allow safe access for ‘scout’ ants under dry conditions, thereby promoting recruitment and ultimately higher prey numbers. The peristome trapping mechanism may therefore represent an adaptation for capturing ants. The relatively rare batch capture events may particularly benefit larger plants with many pitchers. This explains why young plants of many Nepenthes species additionally employ wetness-independent, waxy trapping surfaces.

KEYWORDS: Nepenthes, plant–insect interactions, carnivorous plant, sprey capture, peristome ‘aquaplaning’, collective foraging


Ulrike Bauer, Walter Federle, Hannes Seidel, T. Ulmar Grafe and Christos C. Ioannou. 2015. How to Catch more Prey with Less Effective Traps: Explaining the Evolution of Temporarily Inactive Traps in Carnivorous Pitcher Plants.
Proceedings of the Royal Society B.  DOI: 10.1098/rspb.2014.2675




Cunning carnivorous plants catch more prey by letting some go news.mongabay.com/2015/0225-lbell-carnivorous-plants.html
Ant-Eating Plant Adjusts to Optimize Its Trapping Ability VOANews.com/content/ant-eating-plant-adjusts-optimize-trapping-ability/2598687.html
Carnivorous Pitcher Plant Catches Ants by Changing Slipperiness of Peristome – Ulrike Bauer (2015) NatureDocumentaries.org/8324/carnivorous-pitcher-plant-catches-ants-changing-slipperiness-peristome-ulrike-bauer-2015/

Thursday, February 26, 2015

[Botany • 2015] New Species, Taxonomic Renovations, and Typifications in Gaultheria series Trichophyllae (Ericaceae) from western Yunnan, China


FIGURE 1. Images of Gaultheria series Trichophyllae habitats, and G. albiflora, G. ciliisepala, and G. crassifolia.
A–C. Gaultheria series Trichophyllae habitats: glacially carved valley along road from Gongshan to Dulongjiang, east slope of Gaoligong Shan, ca. 3400 m elev. (A), along trail from Qi Qi Forestry Station to Dong Shao Fang and the pass, east slope of Gaoligong Shan, ca. 3600 m elev. (B), just below Sila Pass, east slope of Biluo Xue Shan, ca. 4000 m elev. (C).
D–F. Gaultheria albiflora, habit (D), fruit, lateral view (E) and apical view (F) (L. Lu LL-2013-50).
G–K. Gaultheria ciliisepala, habit (G), flowers showing variation in size and color (H–I), fruit, lateral view (J) and apical view (K) (G: L. Lu & P.W. Fritsch LL-2011-8; H: L. Lu 06-15; I: L. Lu LL-2014-4; J–K: L. Lu LL-2013-20).
L–P. Gaultheria crassifolia, habit (L), flower, lateral view (M) and apical view (N), fruit, lateral view (O) and apical view (P) (L, P: L. Lu LL-2013-13; M–N, LL-2014-30; O: L. Lu LL-2013-33). Photographs: A, C, E–F, I–L by PWF; B, D, G–H, M–P by LL. Scale bars: D, L, 5 cm; E–F, H–I, M–P, 5 mm; G, 10 cm; J–K, 10 mm.

Abstract

Expeditions to the Gaoligong Mountains and Biluo Snow Mountains in western Yunnan Province, China have uncovered new taxonomic information about the species of Gaultheria series Trichophyllae (Ericaceae) that are known to occur in these ranges. Based on these data, we describe two species as new to science (G. ciliisepala and G. stenophylla) and elevate four varieties (Chiogenes suborbicularis var. albiflorus, G. sinensis vars. crassifolia and major, and G. trichophylla var. obovata) to the species level (as G. albiflora, G. crassifolia, G. major, and G. obovata, respectively). We provide a lectotype and a revised description for G. eciliata because the type was discovered to also include individuals of G. albiflora. Similarly, we provide a lectotype and a revised description for G. sinensis because the type was discovered to also include an individual of G. crassifolia; moreover, the protologue of G. sinensis includes paratypes of three other species. Illustrations and photographic images of living plants in the field are included for all species. Our additions and changes raise the number of species recognized in G. series Trichophyllae from 10 to 16, with more to be expected as the Himalaya-Hengduan Mountains are further surveyed for these plants.

Keywords: Himalaya-Hengduan mountains; lectotypes; new species


Peter W Fritsch, Lu Lu, Hong Wang and De-zhu Li. 2015. New Species, Taxonomic Renovations, and Typifications in Gaultheria series Trichophyllae (Ericaceae).
Phytotaxa. 201(1): 001–026. DOI: 10.11646/phytotaxa.201.1.1

Wednesday, February 25, 2015

[Paleontology • 2015] A Miocene Hyperdiverse Crocodylian Community reveals Peculiar Trophic Dynamics in proto-Amazonian Mega-Wetlands


The massive wetlands once covered the Amazon River basin about 13 million years ago during the late middle Miocene. Three newly discovered species of crocodylians, including Kuttanacaiman iquitosensis (left), Caiman wannlangstoni (right) and Gnatusuchus pebasensis (bottom), look for clams, which they could likely scoop up with their mouths and crunch with their peglike teeth.
Illustration: Javier Herbozo  

Abstract

Amazonia contains one of the world's richest biotas, but origins of this diversity remain obscure. Onset of the Amazon River drainage at approximately 10.5 Ma represented a major shift in Neotropical ecosystems, and proto-Amazonian biotas just prior to this pivotal episode are integral to understanding origins of Amazonian biodiversity, yet vertebrate fossil evidence is extraordinarily rare. Two new species-rich bonebeds from late Middle Miocene proto-Amazonian deposits of northeastern Peru document the same hyperdiverse assemblage of seven co-occurring crocodylian species. Besides the large-bodied Purussaurus and Mourasuchus, all other crocodylians are new taxa, including a stem caiman — Gnatusuchus pebasensis — bearing a massive shovel-shaped mandible, procumbent anterior and globular posterior teeth, and a mammal-like diastema. This unusual species is an extreme exemplar of a radiation of small caimans with crushing dentitions recording peculiar feeding strategies correlated with a peak in proto-Amazonian molluscan diversity and abundance. These faunas evolved within dysoxic marshes and swamps of the long-lived Pebas Mega-Wetland System and declined with inception of the transcontinental Amazon drainage, favouring diversification of longirostrine crocodylians and more modern generalist-feeding caimans. The rise and demise of distinctive, highly productive aquatic ecosystems substantially influenced evolution of Amazonian biodiversity hotspots of crocodylians and other organisms throughout the Neogene.

KEYWORDS: Miocene, caimanine crocodylians, proto-Amazonia, Pebas System, molluscs, durophagy

the newly discovered species Gnatusuchus pebasensis, a crocodylian [13 million years ago] with a short face and rounded teeth that may have shoveled through the mud at the bottom of lakes and swamps to find prey, such as clams and other mollusks. A crocodylian is an order that includes crocodiles, alligators, caimans and gharials 
Model: Kevin Montalbán-Rivera

Excavated fossils from Peru show that seven species of crocodylian lived together in the same place at relatively the same time. The skulls and jaws, shown above, are extremely diverse, the researchers said. They include (1) Gnatusuchus pebasensis, (2) Kuttanacaiman iquitosensis, (3) Caiman wannlangstoni, (4) Purussaurus neivensis, (5) Mourasuchus atopus, (6) Pebas Paleosuchus, and (7) Pebas gavialoid.
Reconstructions: Javier Herbozo & Rodolfo Salas-Gismondi




Rodolfo Salas-Gismondi, John J. Flynn, Patrice Baby, Julia V. Tejada-Lara, Frank P. Wesselingh and Pierre-Olivier Antoine. 2015. A Miocene Hyperdiverse Crocodylian Community reveals Peculiar Trophic Dynamics in proto-Amazonian Mega-Wetlands. Proceedings of the Royal Society B.

Crocs rocked pre-Amazonian Peru: New research uncovers 7 crocodile species in single 13-million-year-old bone bed http://phy.so/344017318 via @physorg_com
Ancient Croc with 'Shovel Mouth', Likely Enjoyed Clam Dinners, Roamed the Amazon http://shar.es/1WdZVx Photos: http://shar.es/1WdZED via @LiveScience

Tuesday, February 24, 2015

[Herpetology • 2015] Euphlyctis kalasgramensis • A New Species of Euphlyctis (Anura: Dicroglossidae) from Barisal, Bangladesh


Figure 3. Photographs illustrating diagnostic characters of Euphlyctis species.
 Ventral views of (A) Euphlyctis cyanophlyctis (adult male, institutional collection’s specimen number: RGCB-5695) and (B) Euphlyctis kalasgramensis sp. nov. (adult male, institutional collection’s specimen number: MHL-B1001) (C) dorso-lateral view of Euphlyctis cyanophlyctis (adult male, institutional collection’s specimen number: RGCB-5695) and (D) dorso-lateral view of Euphlyctis kalasgramensis sp. nov. (adult male, institutional collection’s specimen number: MHL-B1001).

 Abstract
A new species of the genus Euphlyctis is described from the Barisal district of Bangladesh and compared with its morphologically similar and geographically proximate congeners. The new species is highly divergent in comparison to other congeneric species on basis of sequence divergence in mitochondrial DNA gene sequences (ranging from 5.5% to 17.8% divergence). Euphlyctis kalasgramensis sp. nov. can be readily diagnosed by having the following combination of characters: snout-vent length (SVL) 30.44 – 37.88 mm, absence of mid-dorsal line, nostril–snout length 3% of SVL, nostril much closer to snout tip than eye, nostril–snout length 48% of distance from front of eyes to nostril, relative length of fingers (shortest to longest: 1 = 2 < 4 < 3), tibia length 59% of SVL, foot length 55% of SVL.

Figure 2. Photographs of Euphlyctis kalasgramensis sp. nov.
 (A) Dorso-lateral view of male (holotype) (B) Ventral view of male (holotype),
(C)
Ventral view of hand, (D) ventral view of foot, and (E) posterior view of thighs.

Mohammad Sajid Ali Howlader , Abhilash Nair, Sujith V. Gopalan and Juha Merilä. 2015. A New Species of Euphlyctis (Anura: Dicroglossidae) from Barisal, Bangladesh.
PLoS ONE. E 10(2)—e0116666: 1–13. DOI: 10.1371/journal.pone.0116666

[Herpetology • 2014] Bungarus persicus • A New Species of Krait, Bungarus (Elapidae, Bungarinae) and the First Record of that Genus in Iran


Bungarus persicus  
Abtin, Nilson, Mobaraki, Hosseini & Dehgannejhad. 2014

Abstract
We describe a new species of krait (Elapidae, Bungarus) from Baluchistan, Iran and that differs from all species of Bungarus except its closest relative Bungarus sindanus by having 17 dorsal midbody scale rows. The new species differs from the related allopatric Bungarus sindanus and B. caeruleus by a higher number of ventral plates and a different pattern and by an isolated occurrence in Baluchistan (Iran and Pakistan border region). The new species is especial by having a clear black spot in the loreal region and with an occasionally developed loreal plate (on both sides of head in the holotype).

Keywords: Bungarus; Bungarus persicus; new species; Iran


The distribution of Bungarus persicus sp. nov. (Sarbaz, Iran) (1 ) and the Ras Jiunri specimen (Baluchistan – Pakistan) (2 ) (Shockley 1949) and the known distribution of the Sindhi Krait, Bungarus sindanus sindanus in Pakistan and India (3–8 ) and Bungarus sindanus razai in northwestern Punjab, Pakistan and Afghanistan (9 – 12 ). The subspecies Bungarus sindanus walli and are not on the map but it is distributed to the east and southeast in India. The western border for Bungarus caeruleus in Pakistan is indicated by the black line (after Khan, 2002).

Elham Abtin, Göran Nilson, Asghar Mobaraki, Ashraf Ali Hosseini and Mousa Dehgannejhad. 2014. A New Species of Krait, Bungarus (Reptilia, Elapidae, Bungarinae) and the First Record of that Genus in Iran. Russian Journal of Herpetology. 21(4); 243 – 250 

Saturday, February 21, 2015

[Crustacea • 2015] Geosesarma dennerle & G. hagen • New Species of “Vampire Crabs” (Geosesarma De Man, 1892) from central Java, Indonesia, and The Identity of Sesarma (Geosesarma) nodulifera De Man, 1892 (Crustacea, Brachyura, Thoracotremata, Sesarmidae)


Fig. 6. Colours in life. A–C, Geosesarma dennerle, new species, Cilacap, Java;
D–F, G. hagen, new species, Cilacap, Java.

A, B, specimens from type series; C, male (13.1 × 11.7 mm) (ZRC 2014.0271). A, B: 7°25’59”S, 108°55’50”E, Cilacap, Java; F, 7°27’50”S, 108°50’16”E, Cilacap, Java; C–E, from aquarium trade, from Cilacap, Java
(Photographs: Chris Lukhaup [A, B, F]; Tan Heok Hui [C];
Oliver Mengedoht (specimens not preserved) [D, E]).

Abstract
 Two new species of land-dwelling sesarmid crabs of the genus Geosesarma De Man, 1892, are described from central Java, Indonesia. These species have been in the aquarium trade for many years and go by the popular name of “vampire crabs”. The two species, here named Geosesarma dennerle and G. hagen, are formally described and compared with their closest congeners in Java, G. noduliferum (De Man, 1892) and G. bicolor Ng & Davie, 1995. The identities of G. noduliferum, the type species of the genus, and G. confertum (Ortmann, 1894) are also clarified. 

Key words. Crustacea, Brachyura, Sesarmidae, Geosesarma, new species, taxonomy, Java, Indonesia


Geosesarma dennerle Ng, Schubart & Lukhaup, 2015
A, specimens from type series; C, male from aquarium trade, from Cilacap, Java; type locality

Geosesarma hagen Ng, Schubart & Lukhaup, 2015
[left] specimens from aquarium trade, from Cilacap, Java; D, type locality of G. hagen, new species; E, adult on bank of stream; F, an adult male of on moss covered stream bank.



Peter K. L. Ng, Christoph D. Schubart and Christian Lukhaup. 2015. New Species of “Vampire Crabs” (Geosesarma De Man, 1892) from central Java, Indonesia, and The Identity of Sesarma (Geosesarma) nodulifera De Man, 1892 (Crustacea, Brachyura, Thoracotremata, Sesarmidae). Raffles. Bull. Zool. 63.

Friday, February 20, 2015

[Paleontology • 2015] Ichthyosaurus anningae • A New Species of Ichthyosaurus from the Lower Jurassic of West Dorset, England


Life restoration of Ichthyosaurus anningae.
Illustration: James McKay | DOI: 10.1080/02724634.2014.903260

ABSTRACT
We describe a new species of Lower Jurassic (Hettangian/Sinemurian–Pliensbachian) ichthyosaur, Ichthyosaurus anningae, sp. nov., from west Dorset, England, U.K. The holotype of I. anningae (DONMG:1983.98), at least a subadult, is from the lower Pliensbachian Stonebarrow Marl Member (Charmouth Mudstone Formation). It is the most complete ichthyosaur known from this time interval worldwide. The species is assigned to Ichthyosaurus on the basis of humerus, forefin, and pectoral girdle morphologies. Diagnostic features of the species include a short, robust humerus with prominent processes; a femur in which the proximal width is almost as large as the distal width; and a very small femur relative to the humerus (humerus/femur ratio >1.7). Four other specimens, at least three of which are juveniles, are referred to this species. The new species may display sexual dimorphism in humeral morphology, but this cannot be confirmed due to a lack of stratigraphic information. With the recognition of I. anningae, at least three and possibly as many as five ichthyosaur species, representing three genera, are known from the Pliensbachian.





 Lomax, D.R. and Massare, J.A.. 2015. A New Species of Ichthyosaurus from the Lower Jurassic of West Dorset, England. Journal of Vertebrate Paleontology. DOI: 10.1080/02724634.2014.903260



Secret of extinct British marine reptile uncovered
A new species of ichthyosaur, an extinct marine reptile which was alive at the same time as the dinosaurs, has been identified from a fossil found on Dorset’s Jurassic coast.